Part 2. Electrolytes Solutions that contain ions will conduct electricity and ar

Question

Part 2. Electrolytes Solutions that contain ions will conduct electricity and are called electrolytes. In general, the higher the concentration of ions in solution the better it will conduct electricity When ionic solids (salts) dissolve in water they dissociate completely and hydrated positive and negative ions are formed. Salts that are soluble in water are strong electrolytes because they dissociate completely in aqueous solution. Examples: Al2(S04)3, NHsNO3. Compounds that are soluble but only partially dissociate when dissolved in water will produce relatively few ions in solution. Such compounds are poor conductors of electricity and are called weak electrolytes. Examples: H COs (carbonic acid), HF (hydrofluoric acid). We will learn more about behavior of such compounds next semester when we discuss Acid/Base chemistry Finally, compounds that dissolve in water but produce no ions are called nonelectrolytes Examples: CHsCH20H (ethanol), CoOsH12 (sugar). You will learn more about these compounds when you study organic chemistry A. Discuss with your group what it means "partially dissociate and pick from the tree diagrams below the diagram that correctly models the behavior of the HF when it dissolves in water (water molecules are omitted for clarity). Please explain your choice. o O B. Imagine you are given equal volumes of the following solutions: PrtScn End F8 4. T YU

Explanation / Answer

Partially dissociate means only few of the molecules are dissociate into ions. Not the 100% molecule.

Suppose if we take HF. It is a weak electrolyte. So it partially dissociate in water.

HF(aq) <--------> H+ (aq) + F-(aq)

So the aqueous solution of HF solution contains HF molecules , H+ ions and F- ions also.

Diagram III only contains the HF, H+ and F-.

Hence correct option is diagram III.

Diagram I represent the nonelectrolyte. Because no dissociation.

Diagram II represent strong electrolyte. Because all are present in ionic form. Complete dissociation.

Diagram III represent weak electrolyte. Because have some and some electrolyte. Partial dissociation.

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